Ok, here's my deal. I am about to start getting everything I need to hook up my tower speakers and sub in my boat. My factory Kenwood only has one set of rca hookups on the back. I am going to need 3 to hook it all up I think. 2 for the 4 channel for the tower speakers and 1 for the sub. How do I hook all this up? I was told I will need an equalizer to perform this action but I have no experiance w/an equalizer. If anyone could help me out I would greatly appreciate it.

a new head unit with a built in equilizer. My pioneer headunit has 3 sets of hookups. 1 front, 1 back, 1 sub. I would say thats the easiest way to do it